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5526e819 VS |
1 | ///////////////////////////////////////////////////////////////////////////// |
2 | // Name: zipstream.cpp | |
3 | // Purpose: input stream for ZIP archive access | |
4 | // Author: Vaclav Slavik | |
5 | // Copyright: (c) 1999 Vaclav Slavik | |
65571936 | 6 | // Licence: wxWindows licence |
5526e819 VS |
7 | ///////////////////////////////////////////////////////////////////////////// |
8 | ||
14f355c2 | 9 | #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) |
5279a24d | 10 | #pragma implementation "zipstrm.h" |
5526e819 VS |
11 | #endif |
12 | ||
d1af991f RR |
13 | // For compilers that support precompilation, includes "wx.h". |
14 | #include "wx/wxprec.h" | |
5526e819 | 15 | |
d1af991f RR |
16 | #ifdef __BORLANDC__ |
17 | #pragma hdrstop | |
5526e819 VS |
18 | #endif |
19 | ||
e90c1d2a | 20 | #if wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB |
d78b3d64 | 21 | |
d1af991f RR |
22 | #include "wx/log.h" |
23 | #include "wx/intl.h" | |
24 | #include "wx/stream.h" | |
25 | #include "wx/wfstream.h" | |
6001e347 | 26 | #include "wx/zipstrm.h" |
03c0fc66 | 27 | #include "wx/utils.h" |
ea4f5235 JS |
28 | |
29 | /* Not the right solution (paths in makefiles) but... */ | |
30 | #ifdef __BORLANDC__ | |
31 | #include "../common/unzip.h" | |
32 | #else | |
5526e819 | 33 | #include "unzip.h" |
ea4f5235 JS |
34 | #endif |
35 | ||
5526e819 | 36 | |
5526e819 VS |
37 | wxZipInputStream::wxZipInputStream(const wxString& archive, const wxString& file) : wxInputStream() |
38 | { | |
39 | unz_file_info zinfo; | |
40 | ||
41 | m_Pos = 0; | |
42 | m_Size = 0; | |
e83389ff | 43 | m_Archive = (void*) unzOpen(archive.mb_str(wxConvFile)); |
e90c1d2a | 44 | if (m_Archive == NULL) |
d1af991f | 45 | { |
2b5f62a0 | 46 | m_lasterror = wxSTREAM_READ_ERROR; |
5526e819 VS |
47 | return; |
48 | } | |
9d1f22e7 VS |
49 | // TODO what encoding does ZIP use? |
50 | if (unzLocateFile((unzFile)m_Archive, file.ToAscii(), 0) != UNZ_OK) | |
d1af991f | 51 | { |
2b5f62a0 | 52 | m_lasterror = wxSTREAM_READ_ERROR; |
5526e819 VS |
53 | return; |
54 | } | |
e90c1d2a | 55 | |
d1af991f | 56 | unzGetCurrentFileInfo((unzFile)m_Archive, &zinfo, (char*) NULL, 0, (void*) NULL, 0, (char*) NULL, 0); |
5526e819 | 57 | |
e90c1d2a | 58 | if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK) |
d1af991f | 59 | { |
2b5f62a0 | 60 | m_lasterror = wxSTREAM_READ_ERROR; |
5526e819 VS |
61 | return; |
62 | } | |
479cd5de | 63 | m_Size = (size_t)zinfo.uncompressed_size; |
5526e819 VS |
64 | } |
65 | ||
66 | ||
67 | ||
68 | wxZipInputStream::~wxZipInputStream() | |
69 | { | |
e90c1d2a | 70 | if (m_Archive) |
d1af991f | 71 | { |
5526e819 VS |
72 | if (m_Size != 0) |
73 | unzCloseCurrentFile((unzFile)m_Archive); | |
74 | unzClose((unzFile)m_Archive); | |
75 | } | |
76 | } | |
77 | ||
f6bcfd97 BP |
78 | bool wxZipInputStream::Eof() const |
79 | { | |
80 | wxASSERT_MSG( m_Pos <= (off_t)m_Size, | |
81 | _T("wxZipInputStream: invalid current position") ); | |
82 | ||
83 | return m_Pos >= (off_t)m_Size; | |
84 | } | |
5526e819 VS |
85 | |
86 | ||
87 | size_t wxZipInputStream::OnSysRead(void *buffer, size_t bufsize) | |
88 | { | |
f6bcfd97 BP |
89 | wxASSERT_MSG( m_Pos <= (off_t)m_Size, |
90 | _T("wxZipInputStream: invalid current position") ); | |
91 | ||
92 | if ( m_Pos >= (off_t)m_Size ) | |
93 | { | |
2b5f62a0 | 94 | m_lasterror = wxSTREAM_EOF; |
f6bcfd97 BP |
95 | return 0; |
96 | } | |
97 | ||
98 | if (m_Pos + bufsize > m_Size) | |
99 | bufsize = m_Size - m_Pos; | |
100 | ||
5526e819 VS |
101 | unzReadCurrentFile((unzFile)m_Archive, buffer, bufsize); |
102 | m_Pos += bufsize; | |
f6bcfd97 | 103 | |
5526e819 VS |
104 | return bufsize; |
105 | } | |
106 | ||
107 | ||
108 | ||
109 | off_t wxZipInputStream::OnSysSeek(off_t seek, wxSeekMode mode) | |
110 | { | |
cab1a605 | 111 | // NB: since ZIP files don't natively support seeking, we have to |
03c0fc66 | 112 | // implement a brute force workaround -- reading all the data |
cab1a605 | 113 | // between current and the new position (or between beginning of |
03c0fc66 VS |
114 | // the file and new position...) |
115 | ||
5526e819 | 116 | off_t nextpos; |
5526e819 | 117 | |
03c0fc66 | 118 | switch ( mode ) |
d1af991f | 119 | { |
5526e819 VS |
120 | case wxFromCurrent : nextpos = seek + m_Pos; break; |
121 | case wxFromStart : nextpos = seek; break; | |
122 | case wxFromEnd : nextpos = m_Size - 1 + seek; break; | |
123 | default : nextpos = m_Pos; break; /* just to fool compiler, never happens */ | |
124 | } | |
125 | ||
999836aa | 126 | size_t toskip; |
03c0fc66 | 127 | if ( nextpos > m_Pos ) |
d1af991f | 128 | { |
03c0fc66 | 129 | toskip = nextpos - m_Pos; |
5526e819 | 130 | } |
03c0fc66 VS |
131 | else |
132 | { | |
5526e819 | 133 | unzCloseCurrentFile((unzFile)m_Archive); |
e90c1d2a VZ |
134 | if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK) |
135 | { | |
2b5f62a0 | 136 | m_lasterror = wxSTREAM_READ_ERROR; |
5526e819 VS |
137 | return m_Pos; |
138 | } | |
03c0fc66 VS |
139 | toskip = nextpos; |
140 | } | |
cab1a605 | 141 | |
03c0fc66 VS |
142 | if ( toskip > 0 ) |
143 | { | |
144 | const size_t BUFSIZE = 4096; | |
145 | size_t sz; | |
146 | char buffer[BUFSIZE]; | |
147 | while ( toskip > 0 ) | |
148 | { | |
149 | sz = wxMin(toskip, BUFSIZE); | |
150 | unzReadCurrentFile((unzFile)m_Archive, buffer, sz); | |
151 | toskip -= sz; | |
152 | } | |
5526e819 VS |
153 | } |
154 | ||
155 | m_Pos = nextpos; | |
156 | return m_Pos; | |
157 | } | |
158 | ||
d78b3d64 | 159 | #endif |
e90c1d2a | 160 | // wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB |